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// Microsoft Developer & Platform Evangelism
// 
// Copyright (c) Microsoft Corporation. All rights reserved.
// 
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES 
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// herein are fictitious.  No association with any real company,
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// Copyright 2010 Microsoft Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
// See the License for the specific language governing permissions and limitations under the License.

namespace Microsoft.Samples.Data.Services.Common
{
    using System.Collections.Generic;
    using System.Diagnostics;
    using System.Linq;
    using System.Xml;

    internal enum EpmSerializationKind
    {
        Attributes,
        Elements,
        All
    }

    internal abstract class EpmContentSerializerBase
    {
        protected EpmContentSerializerBase(EpmTargetTree tree, bool isSyndication, object element, XmlWriter target)
        {
            this.Root = isSyndication ? tree.SyndicationRoot : tree.NonSyndicationRoot;
            this.Element = element;
            this.Target = target;
            this.Success = false;
        }

        protected EpmTargetPathSegment Root
        {
            get;
            private set;
        }

        protected object Element
        {
            get;
            private set;
        }

        protected XmlWriter Target
        {
            get;
            private set;
        }

        protected bool Success
        {
            get;
            private set;
        }

        internal void Serialize()
        {
            foreach (EpmTargetPathSegment targetSegment in this.Root.SubSegments)
            {
                this.Serialize(targetSegment, EpmSerializationKind.All);
            }

            this.Success = true;
        }

        protected virtual void Serialize(EpmTargetPathSegment targetSegment, EpmSerializationKind kind)
        {
            IEnumerable<EpmTargetPathSegment> segmentsToSerialize;
            switch (kind)
            {
                case EpmSerializationKind.Attributes:
                    segmentsToSerialize = targetSegment.SubSegments.Where(s => s.IsAttribute == true);
                    break;
                case EpmSerializationKind.Elements:
                    segmentsToSerialize = targetSegment.SubSegments.Where(s => s.IsAttribute == false);
                    break;
                default:
                    Debug.Assert(kind == EpmSerializationKind.All, "Must serialize everything");
                    segmentsToSerialize = targetSegment.SubSegments;
                    break;
            }

            foreach (EpmTargetPathSegment segment in segmentsToSerialize)
            {
                this.Serialize(segment, kind);
            }
        }
    }
}